Abstract: The invention describes an electrophotographic recording material composed of an electrically conductive support layer, which is suitable in particular for the production of printing forms or printed circuits, and of a photoconductive layer comprised of an organic photoconductor, a binder and a sensitizer. The photoconductive layer additionally contains a condensation product of benzophenone-2-carboxylic acid and a dialkyl aniline, for example, benzophenone-2-carboxylic acid and diethyl aniline or 4'-methylbenzophenone-2-carboxylic acid and diethyl aniline.

Abstract: Novel Z-3-trihalochalcogenpropenone compounds selected from the group consisting of Z-3-trihaloseleniumpropenone and Z-3-trihalotelluriumpropenone and methods of making such compounds are disclosed. The Z-3-trihalochalcogenpropenone compounds are useful as sensitizers in electrophotographic compositions and elements.

Abstract: Electrophotographic photosensitive material comprising an electroconductive substrate and a layer of a photoconductive composition composed of a dispersion of a charge generating pigment in a charge transporting medium, which is formed on the electroconductive substrate, wherein said photoconductive composition contains an N,N-di-substituted-carbamic acid salt in an amount of 20 to 200% by weight based on the charge generating pigment. This electrophotographic electrophotosensitive material has excellent ozone resistance and shows a high initial charge retention ratio and sensitivity retention ratio when the cycle of charging and light exposure is repeated many times.

Abstract: The present application describes a light-sensitive copying material comprising a support and a light-sensitive layer which contains a surface-active polysiloxane comprised of dialkyl siloxane units and oxyalkylene units. By the addition of the polysiloxane a more uniform coating is achieved, even if only a single solvent is used for the coating solution.

Abstract: Photoconductive compositions composed of an organic photoconductor or a dye-sensitized organic photoconductor are disclosed. The compositions have their sensitivity increased by the addition of a thioamide compound to the photoconductive composition. The photoconductive compositions are used in constructing electrophotographic light-sensitive materials having sufficiently high sensitivity for practical use. Various specific thioamide compounds which have been found to be effective are disclosed.

Abstract: An electrophotographic light-sensitive printing material having a high sensitivity and forming a good printing plate capable of providing clear copies having less stains at non-image areas is disclosed. The material is comprised of a conductive support having formed thereon an electrophotographic light-sensitive layer containing (a) a hydrazone compound, (b) a barbituric acid derivative, a thiobarbituric acid derivative or other charge generating material, and (c) a resin binder.

Abstract: Photoconductive compositions composed of an organic photoconductor or a dye-sensitized organic photoconductor are disclosed. The composition have their sensitivity increased by the addition of an amide compound to the photoconductive composition. The photoconductive compositions are used in constructing electrophotographic light-sensitive materials having sufficiently high sensitivity for practical use. Various specific amide compounds which have been found to be effective are disclosed.

Abstract: Phosphorous diketonate electron accepting compounds are disclosed for use as sensitizers in electron donating photoconductive compositions. Methine dyes having a phosphorous diketonate component and a method of making same are also disclosed.

Abstract: An electrophotographic imaging process having a double charging sequence and a photoreceptor utilized therein are provided, wherein the photoreceptor comprises a substrate, a photosensitive layer comprising a squaric acid methine dye, and an insulating layer. The photosensitive layer may also comprise a squaric acid methine dye and a charge transport material.

Abstract: A photoconductive composition containing as essential components a photoconductive polymer and 1,4-bis(.beta.-cyano-.beta.-alkoxycarbonylvinyl)benzene represented by the following formula (I) ##STR1## wherein R represents a methyl group, an ethyl group, a propyl group or an isopropyl group, present in an amount of about 0.02 mol to 0.5 mol per mol of a .pi.-electron system-containing constitutional repeating unit present in the photoconductive polymer, and which forms a charge transfer complex with the photoconductive polymer through the .pi.-electron system having optical sensitivities in the ultraviolet to visible regions; and an electrophotographic light-sensitive material incorporating the aforesaid photoconductive composition in a layer on a support having a conductive surface.

Abstract: Disclosed is a photosensitive material for the electrophotography, which comprises a dispersion of a charge-generating pigment in a charge-transporting medium composed mainly of a polyvinyl carbazole resin, wherein a perylene pigment represented by the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 stand for a hydrogen atom or a substituted or unsubstituted alkyl or aryl group, is dispersed and incorporated as the charge-generating pigment in an amount of 1 to 40 parts by weight per 100 parts by weight of the polyvinyl carbazole resin and a halogeno-p-benzoquinone is further incorporated in an amount of 1 to 60 parts by weight per 100 parts by weight of the polyvinyl carbazole resin.

Abstract: Photoconductive compositions and elements comprising arylalkane photoconductors and pyrylium sensitizers are stabilized against adverse leuco base color shifts into the ultraviolet to blue spectral region by the incorporation of certain 1,4,5,8-naphthalene bis-dicarboximide compounds. The compositions and elements are particularly suited for electrophotographic image formation and thereafter for contact printing of the image onto sensitive material by ultraviolet or blue transmission through the composition or element.

Abstract: Disclosed are organic photoconductive compositions for use in electrophotography, comprising a polymer containing as main units a naphthalene derivative and/or a naphthacene derivative; and an electron acceptor and/or a sensitizer.

Abstract: An electrophotographic photosensitive material is provided, which has a photosensitive layer formed on an electroconductive substrate and containing a polymeric binder and an organic photoconductor.

Abstract: A light-sensitive organic photoconductorcontaining photoconductive composition for electrophotography is disclosed. The composition has greatly increased light sensitive created by the incorporation of a thiourea compound. The photoconductive composition may further contain a sensitizing dye capable of increasing the sensitivity of the organic photoconductor.

Abstract: Novel chalcogenopentalene compounds having a tellurium atom in the 6a position, and methods of making chalcogenopentalenes having a tellurium or a selenium atom in the 6a position are disclosed. The chalcogenopentalene compounds are useful as sensitizers in electrophotographic compositions and elements containing an electron donor and as charge emitters in multilayer photoconductive elements.

Abstract: A photoconductive composition comprising an organic photoconductive substance and at least one compound represented by the general formula (I) or (II) ##STR1## wherein X is an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an alkoxyl group, a substituted alkoxyl group, an aryloxyl group, or a substituted aryloxy group, n and m are each an integer of 1 or 2, and l and k are each an integer of from 1 to 4, and, optionally, a sensitizing dye capable of increasing the sensitivity of the organic photoconductive substance, and an electrophotographic light-sensitive material comprising a support having an electrically conductive surface and a layer of the photoconductive composition layer on the support. This electrophotographic light-sensitive material has sensitivity and superior stability with time.

Abstract: A photoconductive composition is disclosed which is comprised of an organic photoconductor and a diacylamine compound. The composition may also contain a sensitizing dye for sensitizing the organic photoconductor. In addition there is disclosed an electrophotographic light-sensitive material having on a conductive support a photoconductive light-sensitive layer composed of the foregoing photoconductive composition. The addition of the diacylamine compound greatly increases the light sensitivity of the photoconductive composition containing an organic photoconductor.

Abstract: Disclosed is an organic photosensitive material for electrophotography comprising a charge-transporting medium composed mainly of polyvinyl carbazole and a perylene type pigment as a charge-generating pigment dispersed in said charge-transporting medium, wherein 1 to 30 parts by weight of a halo-naphthoquinone and 1 to 100 parts by weight of phenanthrene or pyrene are incorporated per 100 parts by weight of the polyvinyl carbazole.This photosensitive material is excellent in the sensitivity and the resistance to the repeated light exposure.

Abstract: A photoconductive composition and an electrophotographic light-sensitive material prepared using the photoconductive composition are described. The photoconductive composition comprises an organic photoconductive material and a urea compound, and may further contain a sensitizing dye capable of increasing the light sensitivity of the organic photoconductive material. The electrophotographic light-sensitive material comprises a support having an electrically conductive surface and a layer of the photoconductive composition, provided on the support. Typical urea compounds as used herein are represented by the general formula (I) or (II): ##STR1## (wherein all the symbols are described in the specification). The use of the urea compound increases the sensitivity of the organic photoconductive material making it possible to use the organic material in connection with the preparation of electrophotographic light-sensitive materials.

Abstract: Photoconductive compositions comprising photoconductors and 1,4,5,8-naphthalene bis-dicarboximide sensitizing compounds are disclosed. Compositions and elements containing such compounds are sensitized to radiation below 400 nm. Embodiments are disclosed in which the photoconductor is an arylalkane leuco base. Such embodiments are advantageously nonsensitive to radiation above 400 nm and are also nonpersistent.

Abstract: Disclosed is a photosensitive composition for electrophotography, which comprises 100 parts by weight of polyvinyl carbazole, 5 to 50 parts by weight of a perylene pigment and 5 to 50 parts by weight of a halonaphthoquinone.

Abstract: In a complex type electrophotographic plate comprising an electroconductive support, superposed thereon a charge generating material (CGL) layer and a charge transport material layer superposed on the CGL layer when there is used as said charge transport material at least one compound of the formula:X--(CH.dbd.CH).sub.n --CH.dbd.Ywherein X is a heterocyclic group of the formula: ##STR1## Y is a heterocyclic group of the formula: ##STR2## these heterocyclic groups may be substituted by one or more lower alkyl groups, halogen atoms, or phenyl groups; Z is an oxygen, sulfur or selenium atom; R is an alkyl group having 1 to 7 carbon atoms; n is an integer of 1 or 2; and one hydrogen atom in the group of the formula --(CH.dbd.CH).sub.n -- may be substituted by an alkyl group having 1 to 4 carbon atoms, a halogen atom, a phenyl group, a styryl group or a group of the formula: ##STR3## electrophotographic characteristics such as light sensitivity, dark decay characteristics, repetition characteristics, etc.

Abstract: Photoconductive compositions having both high-speed and high-resolution are disclosed. The composition comprises a film forming electrically insulating polymer and a dye in the form of a dye-dye complex, having a structure according to the formula ##STR1## wherein X.crclbar. represents an anion; the dye has an absorption spectrum which changes when a binderless coating of the dye is treated with solvent vapors, and the composition containing the dye-dye complex has an absorption spectrum which is similar to the changed absorption spectrum of the dye when treated with solvent vapors.

Abstract: Protonic acid-free photoconductive compositions and elements comprising a photoconductor and, as a sensitizer, a 4-tertiaryaminobenzo?b!pyrylium salt or a 4-tertiaryaminobenzo?b!thiopyrylium salt. The resulting compositions and elements exhibit low persistent conductivity.

Abstract: A method of improving image sharpness or image resolution on a dye sensitized electrophotographic photosensitive plate to be negatively charged before image light exposure and with use of positively charged toners, the method comprising applying ultraviolet light to the surface of the dye-sensitized photoconductive layer of the plate before the negative charging. Thereby, it becomes possible to use positively charged toners with excellent resultant image sharpness or resolution.

Abstract: Disclosed is an electrophotographic photosensitive composition which comprises a phthalocyanine type photoconductor dispersed in an electrically insulating resin medium, wherein a nitrophthalic anhydride represented by the following formula: ##STR1## wherein n is a number of 1 or 2, is incorporated as a sensitizer.

Abstract: The present invention is directed to novel amino-substituted 2-cumaryl-3'-chromenylium salts of the general formula ##STR1## wherein R.sup.3 and R.sup.7 are a dialkyl or cycloalkyl disubstituted amino group, hydrogen, or hydroxy group, provided that at least one of R.sup.3 and R.sup.7 is an amino group, R.sup.1, R.sup.2, R.sup.4, R.sup.5, R.sup.6, and R.sup.8 are hydrogen, an alkoxy group, or two of these substituents together form an aromatic ring, provided that R.sup.1, R.sup.2 and R.sup.4 may be the same or different, and R.sup.5, R.sup.6 and R.sup.8 may be the same or different, and Y.sup.- is an acidic anion and to the process for their preparation.

Abstract: Disclosed is a photosensitive composition for electrophotography, which comprises a dispersion of a disazo-type photoconductor in an electrically insulating resin medium, wherein a nitrophthalic anhydride represented by the following formula: ##STR1## wherein n is a number of 1 or 2, is incorporated as a sensitizer.

Abstract: A triphenylmethane polymer, a process for production thereof, and photoconductive compositions and a member containing the polymer are described; the polymer is represented by formula (I) ##STR1## wherein R is an alkyl group, X is H or a methyl group, Z is an alkylene group or a p-xylylene group, Y is H, a methyl group, a methoxy group, a tertiary amino group, halogen, a nitro group or a cyano group, Q is H or a methyl group, and n represents a polymerization degree sufficient to obtain the intrinsic viscosity [.eta.] of the polymer from 0.005 to 1.000.

Abstract: Photoconductive compositions having improved quantum efficiency are disclosed. The compositions comprise:(a) an electron donating photoconductor; and sensitizing amounts of(b) a first electron acceptor selected from cyanine and styryl methine dyes having a 1,3,2-dioxaborin nucleus and(c) a second electron acceptor selected from methine-free compounds having a nucleus selected from the group consisting of 1,3,2-dioxaborin; 1,3,2-oxazoborin and 1,3,2-diazoborins.

Abstract: A photoconductive composition comprising a photoconductive substance and a thiobarbituric acid derivative, and an electrophotographic light-sensitive medium comprising a support having a layer of the photoconductive composition thereon.

Abstract: A thiopyrylium compound having t-butyl groups at the 2- and 6-positions of the thiopyrylium nucleus, having a main absorption near the red region, i.e., 600 to 700 nm but substantially no side absorption near 400 nm, and useful as a sensitizer for a photoconductive composition.

Abstract: An electrophotographic photosensitive material in which organic photoconductor is sensitized by a compound represented by the formula, ##STR1## wherein A, B, D and E represent independently a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, a phenyl group or a 5- or 6-membered heterocyclic ring residue, and at least two of them represent a phenyl group; F is an alkyl, phenyl or styryl group; m is a number of 0 or 1, and n is a number of zero, 1 or 2, provided that when m is 1, n is 0; and X.sup..crclbar. represents an anion residue, has a high sensitivity to the whole range of visible light as well as to the infrared rays of up to around 1,100 nm, and is stable in the potential characteristics such as surface potential and dark damping factor and capable of separation photographing by use of a color separation filter.

Abstract: A photoconductive layer sensitized by a compound of the general formula: ##STR1## in which: R.sup.1 and R.sup.2 independently represent a hydrogen atom, an alkyl or substituted alkyl group, an aryl or substituted aryl group, an aralkyl or substituted aralkyl group, a cycloaliphatic or substituted cycloaliphatic group or a heterocyclic or substituted heterocyclic group providing R.sup.1 and R.sup.2 do not both represent cyclic groups of aromatic nature, or R.sup.1 and R.sup.2 together may represent the necessary atoms to complete a non-aromatic heterocyclic ring,R.sup.3, R.sup.4, R.sup.5 and R.sup.6 independently represent a hydrogen atom or any substituent providing the sum of their .sigma..sub.p constants has a value of less than +0.5, or R.sup.3 and R.sup.4 and/or R.sup.5 and R.sup.6 may represent the necessary atoms to complete an alicyclic or aromatic ring, R.sup.3 and R.sup.2 and/or R.sup.1 and R.sup.6 may represent the necessary atoms to complete a non-aromatic heterocyclic ring,R.sup.7 and R.sup.

Abstract: A photoconductive layer embodies the combination of an organic photoconductive donor compound, such as poly(N-vinyl) carbazole and derivatives thereof, and an acceptor-sensitizer compound having the general formula ##STR1## in which M is a metal such as boron, aluminum, gallium, indium and thallium, X and Y are oxygen sulphur, nitrogen, phosphorus, antimony or selenium, Z.sub.1 and Z.sub.2 are halogen, or substituted or unsubstituted alkyl, alkaryl or heterocyclic groups, R.sub.1 and R.sub.2 are substituted or unsubstituted aryl, alkaryl, alkyl or alicyclic groups, and n is 2 or 3.

Abstract: Novel benzotelluropyrylium diketonate dyes are disclosed. The dyes are useful in improving the performance of electron donating photoconductive compositions and elements. Methods for making the dye sensitizers are also disclosed.

Abstract: Novel telluropyrylium dyes are disclosed. The dyes are useful as electron accepting sensitizers for electron donating photoconductive compositions. Novel methods making the dyes are also disclosed.

Abstract: A photoconductive layer is produced upon a substrate by coating the substrate with a solution in an organic solvent of a polyamic acid and of 2,4,7-trinitro-9-fluorenone (TNF) and/or 2,4,5,7-tetranitro-9-fluorenone and heating the coated substrate at a temperature not exceeding 150.degree. C. to form on the substrate a polyimide coating containing the said fluorenone compound as a photosensitizer.

Abstract: A photoconductive composition for electrophotography containing a photoconductive material, a sensitizing dye comprising a specific very stable sensitizing dye for red light to infrared rays, and a film-forming polymer binder.

Abstract: A photosensitive material for electrophotography having an improved photosensitivity is provided, which comprises copper phthalocyanine as a photoconductor, 2,5-bis(4'-diethylaminophenyl)-1,3,4-oxadiazole as a charge transport material and a binder resin in which said photoconductor and charge transport material are dispersed. The content of the binder resin is 50 to 70% by weight based on the total amount of the photosensitive material and the weight ratio of copper phthalocyanine to 2,5-bis(4'-diethylaminophenyl)-1,3,4-oxadiazole is in the range of from 2.5 to 6.5.

Abstract: A process for electrophotographic reproduction, and a layered electrophotographic plate having a conventional charge generation layer and a p-type hydrazone containing charge transport layer, in which the surface of the charge transport layer is selectively discharged by actinic radiation as a result of the migration through the transport layer of charges generated in the charge generation layer as a result of the actinic radiation and injected into the transport layer, the hydrazone having the composition p-diethylaminobenzaldehyde-(diphenylhydrazone), i.e., ##STR1## and the charge transport layer including DEASP or Acetosol Yellow in an amount not exceeding 13 wt. % of the hydrazone.

Abstract: Photoconductive compositions and electrophotographic photoreceptive materials are described containing a photo-conductive substance and a 5-nitrofurfural derivative represented by formula (1) ##STR1## wherein A represents atoms which form, together with the carbon atom, a moiety represented by one of formulae (2) to (10) ##STR2## wherein R represents a straight or branched chain alkyl group containing from 1 to 12 carbon atoms, X represents a group having a Hammett .sigma. value of at least 0.

Abstract: Organic electron donor compounds for use in electrophotographic constructions must ordinarily be sensitized to desired regions of the electromagnetic spectrum. Highly fluorinated aliphatic sulfonyl, carbonyl, or carbonyloxy dyes have been found to be efficient sensitizers for such organic donor compounds.

Abstract: Organic electron donor compounds for use in electrophotographic constructions must ordinarily be sensitized to desired regions of the electromagnetic spectrum. Imidazo[4,5-b] quinoxaline cyanine dyes having phenylsulfonyl or benzoyl substituents have been found to be efficient sensitizers for such organic donor compounds.

Abstract: A photoconductive layer is produced upon a substrate by coating the substrate with a solution in an organic solvent of a polyamic acid and of 2,4,7-trinitro-9-fluorenone (TNF) and/or 2,3,4,7-tetranitro-9-fluorenone and heating the coated substrate at a temperature not exceeding 150.degree. C. to form on the substrate a polyimide coating containing the said fluorenone compound as a photosensitizer.

Abstract: A plurality of aggregate photoconductive particles having a predominant particle size of less than about 1.0 micron are disclosed. Such particles are useful in heterogeneous photoconductive compositions, electrophotographic elements and electrophotographic imaging processes.

Abstract: A photoconductive composition comprising a photoconductive substance and a thiobarbituric acid derivative, and an electrophotographic light-sensitive material comprising a support having a layer of the photoconductive composition thereon.

Abstract: Polycyanoanthracenes containing three or more cyano groups, and in particular the novel compound 2,6,9,10-tetracyanoanthracene, are sensitizers for organic photoconductors.

Abstract: Photoconductive compositions and materials including photoconductive substances and spectral sensitizers, are described; the sensitizers comprise diazastyryl dyes represented by formula (I) ##STR1## wherein R.sub.1 represents an alkyl group, R.sub.2 represents hydrogen, an alkyl group or an alkoxy group, R.sub.3 and R.sub.4 each represent an alkyl group or R.sub.3 and R.sub.4 together represent a group completing nitrogen-containing heterocyclic groups and A represents a group completing (a) benzothiazolium ring, (b) thiazolium ring, (c) imidazolium ring, (d) triazolium ring, (e) thiadiazolium ring, (f) pyridinium ring, (g) indazolium ring or (h) indolenium ring.